The 13 inch MacBook Pro already does have a built in disk drive so it is pointless. Also the 13 inch MacBook Pro does not have retina display. Only 2 models of any mac have retina display. If you want retina display buy a macbook pro with retina display or an iPod touch,iPad,and iPhone have that.

The Apple USB SuperDrive only works with Macs that do not have built in SuperDrives. Of the MacBook Pro line the Retina display [15"(which is the only size right now for the MacBook Pro Retina display model)] is the only one that works with the SuperDrive because it does not have a built in SuperDrive.

This Apple USB SuperDrive connects to your MacBook Pro with Retina display, MacBook Air or Mac mini. Any Macs other than those listed under the system requirements and in the product description would not be supported.

The 13" macbook pro doesn't need this, as it has a built in drive. The retina screen equipped mac book pro on the other hand does not, hence why they state that it is compatible with this model. Hope this helps.

There really isn't a need for the superdrive because the MacBook Pro 13" already has a CD drive, The reason the MacBook Pro with Retina would need it is because the disc drive has been removed from the device in order to make it thinner and allow more space for the batteries.